For hundreds of thousands of people every year who dream of studying or researching in the United States, a student visa is the golden ticket.

Secretary of State Marco Rubio said last month that he's revoked at least 300 visas of students he described as "lunatics," citing pro-Palestinian support or activism, activities that are normally considered protected First Amendment rights, USA TODAY reported.

UCLA confirmed that an international student was detained at the U.S.-Mexico border. A campus rally was quickly organized in her support.